using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
using System.IO;
using System.Net.Http;
using System.Net.Http.Headers;
using Amazon.S3;
using Amazon.S3.Transfer;

namespace rockfishCore.Util
{
    public static class OpsDiagnostics
    {
        private const int S3_EXPECTED_FILE_COUNT=24;
        public static readonly string[] S3_EXPECTED_BACKUP_FILE_PREFIXES = 
        { "biz-docker-website-backup-", "biz-letsencryptbackup-", "biz-pecklist-db-backup-", "biz-rockfish-db-backup-",
        "devops-docker-le-config-backup-","forum-backup-", "mail-svn-repo-backup-" };
        private const string S3_SECRET_KEY = "iNwbHr+sK+9is2wmRjIax+rdyEjLNvWKJBYr7w4txkY";
        private const string S3_ACCESS_KEY = "CMPAFDNX53OWPC55HBJ4";
        private const string S3_HOST_ENDPOINT = "https://nyc3.digitaloceanspaces.com";

        private static HttpClient Client = new HttpClient();


        public static bool CheckWebsite(string url, string mustContain)
        {
            bool Result = false;
            var Response = Client.GetAsync(url).Result;
            if (Response.IsSuccessStatusCode)
            {
                var PageText = Response.Content.ReadAsStringAsync().Result;
                if (PageText.Contains(mustContain))
                {
                    Result = true;
                }
            }
            return Result;
        }


        public static List<string> GetFileListFromSpacesBackupStorage()
        {

            AmazonS3Config clientConfig = new AmazonS3Config();
            clientConfig.ServiceURL = S3_HOST_ENDPOINT;
            IAmazonS3 s3Client = new AmazonS3Client(S3_ACCESS_KEY, S3_SECRET_KEY, clientConfig);
            var objectList = s3Client.ListObjectsAsync("gztw1").Result;
            var fileList = objectList.S3Objects.Select(c => c.Key).ToList();
            return fileList;
        }

        public static bool VerifyBackups()
        {
            bool ret=false;
            var SpacesFileNames = GetFileListFromSpacesBackupStorage();
            if (SpacesFileNames.Count != S3_EXPECTED_FILE_COUNT) return ret;
            //get yesterday's date in the same format as the backup creates
            var ExpectedBackupDateString=DateTime.Today.AddDays(-1).ToString("yyMMdd");
            int foundMatches=0;
            foreach(string ExpectedFileName in S3_EXPECTED_BACKUP_FILE_PREFIXES){
                foreach(string FileName in SpacesFileNames){
                    if(FileName.StartsWith(ExpectedFileName+ExpectedBackupDateString)){
                        foundMatches++;
                        break;
                    }
                }
            }

            if(foundMatches==S3_EXPECTED_BACKUP_FILE_PREFIXES.Length){
                ret=true;
            }

            return ret;

        }



    }//eoc

}//eons